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Income taxes - Reconciliation of Income Taxes Computed at the United States Federal Statutory Tax Rates to the Provision for Income Taxes (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Tax Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Federal taxes calculated at statutory rate, amount |  |  |  |  |  |  |  |  | $ 17,317 | $ 23,003 | $ 22,230
Amount increase (decrease) resulting from: |  |  |  |  |  |  |  |  |  |  |
State taxes, net of federal benefit |  |  |  |  |  |  |  |  | 3,197 | 4,792 | 4,666
Expense (benefit) from equity based compensation |  |  |  |  |  |  |  |  | 153 | (1,353) | (870)
Municipal interest income, net of interest disallowance |  |  |  |  |  |  |  |  | (1,507) | (908) | (837)
Bank owned life insurance |  |  |  |  |  |  |  |  | (327) | (51) | (51)
Merger costs |  |  |  |  |  |  |  |  | 289 | 66 | 141
Other |  |  |  |  |  |  |  |  | (290) | 176 | 339
Total | $ 13,337 | $ (2,040) | $ 7,455 | $ 80 | $ 5,718 | $ 7,718 | $ 6,314 | $ 5,975 | $ 18,832 | $ 25,725 | $ 25,618
Federal taxes calculated at statutory rate, percent |  |  |  |  |  |  |  |  | 21.00% | 21.00% | 21.00%
Percentage increase (decrease) resulting from: |  |  |  |  |  |  |  |  |  |  |
State taxes, net of federal benefit |  |  |  |  |  |  |  |  | 3.90% | 4.40% | 4.40%
Expense (benefit) from equity based compensation |  |  |  |  |  |  |  |  | 0.20% | (1.20%) | (0.80%)
Municipal interest income, net of interest disallowance |  |  |  |  |  |  |  |  | (1.80%) | (0.80%) | (0.80%)
Bank owned life insurance |  |  |  |  |  |  |  |  | (0.40%) | (0.10%) | 0.00%
Merger costs |  |  |  |  |  |  |  |  | 0.40% | 0.10% | 0.10%
Other |  |  |  |  |  |  |  |  | (0.40%) | 0.10% | 0.30%
Total |  |  |  |  |  |  |  |  | 22.90% | 23.50% | 24.20%

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